Heat exchanging apparatus

Abstract: The heat absorbing member formed by connecting to the bottom portion of the inlet header (1) with that of the outlet header (2) through the heat absorbing tube is installed so that the heat absorbing tube is located in the heating container (9), the heat absorbing tube (16) is comprised of a plurality of the down tubes (3, 4) and down tubes (5, 6) all with lower ends closed and connected under the inlet header (1) and outlet header (2) respectively, and the spiral tubes (7, 8) which connect to the top with the bottom portion of the down tubes (3, 4) and down tubes (5, 6), and the spiral tubes (7, 8) are the same length.

Description: BACKGROUND OF THE INVENTION The present invention relates to an apparatus for heat exchange between liquids, gas and liquid, and gases, and more particularly, between liquids, see for example DE-A-1932027. As the conventional heat exchanging apparatus has often been used as such between the heating medium, which is either a high temperature liquid or gas, and the liquid as shown in Fig. 3, this is used as an example for description. In this apparatus, a heat absorbing member 30 comprising of a heat absorbing tube 31 connecting a bottom portion of an inlet header 1 with that of an outlet header 2, with the heat absorbing tube 31 below the outlet header 2 being of a spiral form, is installed while locating the heat absorbing tube 31 inside the heating container 9. The heating container 9 is provided with a heating medium inlet 11 and outlet 12, respectively for supply and discharge of the heating medium. In heating the liquid by the above type of heat exchanging apparatus while the liquid is supplied from the inlet header 1 into the heat absorbing tube 31, the heating medium is supplied through the heating medium inlet 11 into the heating container 9. The hot water obtained through heat exchange between the heating medium and the liquid in the heat absorbing tube 31 is supplied through the outlet header 2 to the load unit (not shown). On the other hand, the heating medium is discharged through the heating medium outlet 12. If this heat exchanging apparatus is used to supply hot water to a plurality of load units, such as three load units including heater 13, a hot water supply unit 14, and a bathtub 15, as shown in Fig. 4, three heat absorbing members 30A, 30B, and 30C must be installed in the heating container 9 in correspondence to these loads. To supply the hot water to the load, the inlet header 1A and outlet header 2A of the heat absorbing member 30A are connected to the heater 13 through a pipeline 17, in which a pump 18' is incorporated, while the water supply source 18 connected to the inlet header 1A of the heat absorbing member 30, the outlet header 2B is connected to the hot water supply unit 14 and the inlet header 1C and outlet header 2C of the heat absorbing member 30C connected to the bathtub 15 through the pipeline 21, in which the pump 20 is incorporated. The heat exchanging apparatus of the above type has only one heat absorbing tube 31 on one heat absorbing member 30, resulting in poor heat exchange efficiency between the liquid in the heat absorbing tube 31 and the heating medium in the heating container 9. Moreover, to supply hot water to a plurality of load units, such as heaters, there must be a plurality of heat absorbing members 30 in the heating container 9. Therefore, problems arise, like the need for a large amount of heating medium as well as an increased size of the heating container 9. SUMMARY OF THE INVENTION It is the object of the present invention to solve the above problems associated with the conventional heat exchanging apparatus and to provide a heat exchanging apparatus which can supply hot water to a plurality of load units, such as heaters, without increasing the heating container size and without the need of a large quantity of heating medium. This heat exchanging apparatus has a plurality of heat absorbing tubes provided to one heat absorbing member, with satisfactory heat exchange efficiency accomplished between the liquid in the heat absorbing tubes and the heating medium in the heating container. Moreover, each heat absorbing tube comprises of the spiral tubes of the same length, ensuring easier procurement, stock control, and production control of the tube materials. In order to accomplish the above object there is provided a heat exchanging apparatus as defined in claim 1. The heat absorbing tube 16 comprises of a plurality of inlet down tubes 3 and 5 and outlet down tubes 4 and 6, all with the lower end closed and respectively installed under the inlet header 1 and outlet header 2, and spiral tubes 7 and 8 connecting the top portion with the bottom portion of down tubes 3 and 5 and down tubes 4 and 6 and also having the same length of spiral tubes 7 and 8. Further more, according to the present invention, a plurality of sets of heat absorbing members 10 have the spiral tubes 7 and 8 concentrically arranged and the inlet and outlet headers 1 and 2 located on approximately the same plane. In addition, according to the present invention, the diameter of spiral tubes 7 and 8 differs among sets of heat absorbing tubes 10. In the afore-mentioned heat exchanging apparatus, to heat the fluid, it is supplied from the inlet header 1 of the heat absorbing member 10 to the down tubes 3 and 5 and is allowed to flow from their lower ends into the connected spiral tubes 7 and 8 to rise and reach the outlet header 2 through the top portion of the down tubes 4 and 6. On the other hand, the heating medium is supplied into the heating container 9 for heat exchange with the fluid in down tubes 3, 4, 5, and 6 and in spiral tubes 7 and 8. The fluid thus heated is supplied from the outlet header 2 to the load unit while the heating medium is discharged from the heating container 9. When the heated fluid is to be supplied from the heat exchanging apparatus according to the present invention to a plurality of load units, the outlet headers 2A, 2B, and 2C of the corresponding number of heat absorbing members 10A, 10B, and 10C are connected to the respective load units, enabling a supply of the heated fluid in the same manner as with a conventional heat exchanging apparatus. BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings; Fig. 1 is a vertical sectional front view showing a part of the first preferred embodiment of the present invention. Fig. 2 is a plan view showing the use condition of the second preferred embodiment of the present invention. Fig. 3 is a view similar to Fig. 1, showing the conventional embodiment similar to the present invention. Fig. 4 is a view similar to Fig. 2 for the above conventional embodiment. DESCRIPTION OF THE PREFERRED EMBODIMENT In the preferred embodiment of the present invention shown in the figures, the portions similar to the conventional heat exchanging apparatus are provided with the same symbols as for the conventional types, for which a description is omitted. The description here is therefore concerned only with the portion different from the conventional heat exchanging apparatus. In the first preferred embodiment shown in Fig. 1, the bottom portion of the inlet header 1 and that of the outlet header 2 of the heat absorbing member 10 are provided with the heat absorbing tubing 16 to connect these headers, and the heat absorbing tubing 16 comprises of a plurality of inlet down tubes 3 and 5 and of outlet down tubes 4 and 6, all with the lower ends closed, and a plurality of spiral tubes 7 and 8 which connect the top with the bottom portions of down tubes 3 and 5 and down tubes 4 and 6 and which are the same in length. A variation of this preferred embodiment may have a vertical multistage construction, in which the similar down tubes (not shown) are connected below the down tubes 3 and 5 and down tubes 4 and 6 and the spiral tubes 7 and 8 are connected to these down tubes in the manner described above. Down tubes 3 and 5, down tubes 4 and 6, and spiral tubes 7 and 8 make up a pair of tubes in this preferred embodiment, but the number of tube pairs may be increased. Fig. 2 shows the second preferred embodiment of the present invention. This is for a plurality of load units and supplies hot water to three load units, that is, the heater 13, hot water supply unit 14, and bathtub 15. This preferred embodiment differs from the first one in that three heat absorbing members 10A, 10B, and 10C are located so that the spiral tubes 7 and 8 are arranged concentrically in the heating container 9 and their inlet and outlet headers 1A, 1B, and 1C and 2A, 2B, and 2C are on approximately the same plane. It should be noted here that the number of heat absorbing members 10 increases or decreases depending on the quantity of load units and the plane shape of spiral tubes 7 and 8 may be circular or polygonal. To heat the liquid with the heat exchanging apparatus according to the present invention, the liquid is supplied from the inlet header 1 of the heat absorbing member 10 to the down tubes 3 and 5, through the bottom portion of which the liquid is supplied to rise through the spiral tubes 7 and 8 to the outlet header 2 through the top of the down tubes 4 and 6. At the same time, the heating medium is supplied from the heating medium inlet 11 into the heating container 9 in which heat exchange is achieved between this heating medium and the liquid in the down tubes 3 and 4 as well as in 5 and 6 and in the spiral tubes 7 and 8. The hot water thus heated is then supplied through the outlet header 2 to the load unit (not shown), while the heating medium is discharged through the heating medium outlet 12. To supply hot water from a heat exchanging apparatus of this type to three load units of the heater 13, hot water supply unit 14, and bathtub 15, the output header 2A, 2B, and 2C of three heat absorbing members 10A, 10B, and 10C, respectively corresponding to each of the above three loads, are connected to the heater 13, hot water supply unit 14, and bathtub 15, supplying the hot water in the same manner as a conventional heat exchanging apparatus. Fluid to be heated in the above preferred embodiment was liquid, but may also be gas, for instance, that which is used in a drying room. As the length is the same for both spiral tubes 7 and 8 in the above preferred embodiment, the straight tubes from which these spiral tubes are manufactured are also the same in length regardless of whether the raw tubes are the drawn or welded tubes. Therefore, it is not necessary to prepare tubes of different lengths based on the calculation made for the manufacture of spiral tubes 7 and 8. This in turn makes procurement, stock control, and production control of raw material tubes and adaptation of multi-product small-lot manufacture easier. By varying the diameter of spiral tubes 7 and 8 for each set of heat absorbing members 10, it becomes possible for the supply of hot water to use the small size spiral tubes 7 and 8 in such places as a washstand or kitchen where a small quantity of hot water is used frequently or to use large size spiral tubes 7 and 8 in such places as a large bath or pool where a large quantity of hot water is used for a long period of time. As so far described, the present invention comprising of a plurality of heat absorbing tubes provided to one heat absorbing member ensures a superior heat exchange efficiency between the liquid in the heat absorbing tube and the heating medium in the heating container. Each heat absorbing tube is made from spiral tubes of the same length, making procurement, stock control, and production control of raw tube materials easier. Moreover, the present invention produces a supply of hot water of the right temperature and quantity to the load units, such as a plurality of heaters, etc., without increasing the size of the heating container and without requiring a large quantity of heating medium.

Claims: A heat exchanging apparatus comprising a heating container (9) having a heating medium inlet (11) and a heating medium outlet (12), and at least one heat absorbing member (10) installed into said container (9); said member (10) being formed of an inlet header (1), an outlet header (2), and a heat absorbing tubing (16); said tubing (16) including a plurality of inlet down tubes (3 and 5) connected to a bottom portion of said inlet header (1), a plurality of outlet down tubes (4 and 6) connected to a bottom portion of said outlet header (2), and a plurality of spiral tubes (7 and 8) associated with said inlet down tubes (3 and 5) and said outlet down tubes (4 and 6), all said down tube means (3-6) being downwardly closed; said spiral tubes (7 and 8) having all the same length, each one said spiral tubes (7, 8) being connected between a bottom portion of the associated inlet down tube (3, 5) and a top portion of the associated outlet tube (4, 6). A heat exchanging apparatus according to claim 1, wherein a plurality of heat absorbing members (10) are installed in said container (9) to supply associated load units (13-15), characterized in that each absorbing member (10) comprises a corresponding inlet header (1A-1C), a corresponding outlet header (2A-2C), and a corresponding tubing (16), each said tubing (16) including a pair of said inlet down tubes (3, 5), a pair of said outlet down tubes (4, 6) and a pair of spiral tubes (7, 8); the spiral tubes (7, 8) of said members (10) being concentrically arranged, said inlet and outlet headers (1A-1C; 2A-2C) being located on approximately the same plane. A heat exchanging apparatus according to claim 2, characterized in that the diameter of said pairs of spiral tubes (7, 8) of said heat absorbing members (10) differs according to said associated load units (13-15).

Inventors: MARUYAMA NOBORU, MARUYAMA, NOBORU
Applicants: MARUYAMA NOBORU, MARUYAMA, NOBORU
Application year: 1994
Main classification: F28D7
IPC codes: F28D7, F28D1